Source : Free On-Line Dictionary of Computing

SML
     
        1. {Standard ML}.
     
        2. Small Machine Language.  Barnes, ICI 1969.  Real-time
        language, an ALGOL variant, and the predecessor of RTL.  "SML
        User's Guide", J.G.P.  Barnes, ICI, TR JGPB/69/35 (1969).

SML#
     
        An extension of SML/NJ with polymorphic field selection and
        nondestructive field update.  "A Compilation Method for
        ML-style Polymorphic Record Calculi", A. Ohori, POPL 1992.
     
        {(ftp://ftp.cis.upenn.edu/pub/sml#/)}.